NI 6509 User Guide and Specifications
20
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Power-on state ........................................Inputs high-Z (default),
user-selectable input,
output 1 or 0
Data transfers ..........................................Interrupts, programmed I/O
I/O connector ..........................................100-pin female 0.050 series SCSI
Digital Logic Levels
Input Signals
The maximum input logic high and output logic high voltages assume a
Vcc supply voltage of 5.0 V. Given a Vcc supply voltage of 5.0 V, the
absolute maximum voltage rating for each I/O line is –0.5 V to 5.5 V with
respect to GND.
Output Signals (Vcc = 5 V)
The total current sinking/sourcing from one port cannot exceed 100 mA.
+5V power available at
I/O connector (pins 49 and 99) ...............+4.65 to +5.25 V
Note
The I/O connector power has a fuse for overcurrent protection. This fuse is not
customer replaceable. If the fuse is blown, return the device to NI for repair.
Programmable power-up states
response time ..........................................400 ms
Level
Min
Max
Input voltage (V
I
)
0 V
Vcc
Input logic low voltage (V
IL
)
—
0.8 V
Input logic high voltage (V
IH
)
2 V
—
Level
Min
Max
High-level output current (I
OH
)
—
–24 mA
Low-level output current (I
OL
)
—
24 mA
Output voltage (V
O
)
0
Vcc
Output low voltage (V
OL
), at 24 mA
—
0.55 V
Output high voltage (V
OH
), at –24 mA
3.7 V
—
